REFRIGERANT CIRCULATION TYPE AIR CONDITIONING SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent the circulation of a refrigerant from being stopped by opening a valve body of an expansion valve fully and forcibly when the temperature on the side of a refrigerant liquid falls below a set temperature during the heating operation or exceeds a set temperature during the cooling operation regardless of a difference in temperature between that on the inlet side of the refrigerant and that on the outlet side thereof to heat exchangers of fan coil units. SOLUTION: Fan coil units 2 are each provided with a temperature sensor 8 which always measures temperature on the side of a refrigerant of heat exchangers of fan coil units 2 to transmit an electrical signal when the temperature measured exceeds a value set during the cooling operation or to transmit an electrical signal when the temperature measured falls below the set value during the heating operation. A controller 9 is provided to energize an expansion valve 21 for controlling the supply of the refrigerant by a signal from the temperature sensor 8 to open a valve body thereof fully during the cooling and heating operations separately.